Murali Karthikeyan Muthuraman, better known by stage name Karthik, is an Indian film actor, playback singer and politician who works mainly in Tamil cinema. He is the son of actor R. Muthuraman. He was first introduced by Bharathiraja in the film Alaigal Oivathillai. He has primarily appeared in lead roles in Tamil films, who was also known as Navarasa Nayagan. He has also appeared in some Telugu films. Karthik has acted in more than 125 films.